CN111735707A - Method and device for testing packaging strength of lithium ion soft package battery - Google Patents
Method and device for testing packaging strength of lithium ion soft package battery Download PDFInfo
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- CN111735707A CN111735707A CN202010603336.2A CN202010603336A CN111735707A CN 111735707 A CN111735707 A CN 111735707A CN 202010603336 A CN202010603336 A CN 202010603336A CN 111735707 A CN111735707 A CN 111735707A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 100
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 65
- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002985 plastic film Substances 0.000 claims abstract description 24
- 229920006255 plastic film Polymers 0.000 claims abstract description 24
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- 238000003825 pressing Methods 0.000 claims description 28
- 239000000758 substrate Substances 0.000 claims description 27
- 229920000642 polymer Polymers 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 8
- 238000005538 encapsulation Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 5
- 239000005022 packaging material Substances 0.000 abstract description 4
- 238000012858 packaging process Methods 0.000 abstract description 4
- 238000011158 quantitative evaluation Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000001192 hot extrusion Methods 0.000 description 3
- 239000012785 packaging film Substances 0.000 description 3
- 229920006280 packaging film Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- Health & Medical Sciences (AREA)
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- Chemical & Material Sciences (AREA)
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- Battery Mounting, Suspending (AREA)
Abstract
The invention provides a method and a device for testing the packaging strength of a lithium ion soft package battery, wherein the method for testing the packaging strength of the lithium ion soft package battery comprises the steps of horizontally placing and fixing the lithium ion soft package battery to be tested, introducing compressed gas into an aluminum plastic film of the lithium ion soft package battery to be tested, recording the stopping time of the battery from the beginning of inflation to the occurrence of fracture of the battery or the reaching of the preset time, and calculating to obtain the packaging strength. According to the method for testing the packaging strength of the lithium ion soft package battery, after the battery is fixed, compressed gas is injected into the battery, the situation that the battery fails in packaging in the real use process (the battery is in a module or a pack) is simulated, the quantitative evaluation of the packaging strength of the battery can be realized, and the method has more accurate and visual guiding significance for the selection of the battery packaging material, the packaging process design and the evaluation of the battery reliability.
Description
Technical Field
The invention belongs to the technical field of lithium ion soft package battery testing, and particularly relates to a method and a device for testing the packaging strength of a lithium ion soft package battery.
Background
The lithium ion soft package battery cell is a lithium ion battery which uses an aluminum plastic packaging film as a packaging material. Relatively speaking, the packaging of lithium ion batteries is divided into two broad categories, one is soft package batteries and the other is metal-case batteries.
The two shells are made of different materials, so that the packaging modes are different. Soft pouch cells are hot extrusion packaged, while metal can cells are typically welded (laser welded). The reason why the pouch battery can be packaged by hot extrusion is that it uses a material such as an aluminum plastic packaging film.
The aluminum-plastic packaging film (aluminum-plastic film for short) is composed of three layers: nylon layer, Al layer and PP layer. The three layers have respective functions, and the nylon layer ensures the appearance of the aluminum plastic film and prevents the shell from being scratched. The Al layer is a layer of metallic Al, which serves to shape and support and prevent water and air from entering the cell. PP is the abbreviation for polypropylene, and this material has the property of melting at temperatures of more than one hundred degrees celsius and of being viscous. Therefore, the hot extrusion packaging of the battery mainly depends on that the PP layer is melted and bonded together under the heating effect of the seal head, then the seal head is removed, and the cooling is solidified and bonded. By measuring the packaging strength of the aluminum-plastic film, the reliability of the battery packaging process can be judged in time, and the method is particularly important for the type selection of the aluminum-plastic film material.
At present, the packaging strength of a specific part of a battery is generally represented by adopting a tension test in the industry, namely, the aluminum-plastic film packaged at the specific part is cut and sampled, the two surfaces of the aluminum-plastic film at the packaging part are clamped tightly by using a tension machine, and the tension during separation is measured. And the actual scenario of package failure is: the chemical reaction occurs in the battery, and the generated gas leads the packaging part to be gradually opened from the inside so as to lose the packaging effect. Therefore, the current measuring method has great difference with the actual working condition.
Disclosure of Invention
In view of the above, the invention aims to provide a device for testing the packaging strength of a lithium ion soft package battery, so as to overcome the defects of the prior art, and the device is used for injecting compressed gas into the battery after the battery is fixed, so that the situation that the battery fails in packaging during the actual use process (the battery is in a module or a pack) is simulated, the quantitative evaluation of the packaging strength of the battery can be realized, and the device has more accurate and intuitive guiding significance on the selection of battery packaging materials, the packaging process design and the reliability evaluation of the battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for testing the packaging strength of a lithium ion soft package battery comprises the steps of horizontally placing and fixing the lithium ion soft package battery to be tested, introducing compressed gas into an aluminum plastic film of the lithium ion soft package battery to be tested, recording the stopping time of the battery from the beginning of inflation to the time when the battery breaks or reaches the preset time, and calculating to obtain the packaging strength.
Preferably, the method for fixing the lithium ion soft package battery to be tested is to uniformly apply pressure to the upper surface and the lower surface of the lithium ion soft package battery to be tested, so that the thickness of the battery is always kept at the thickness of the battery core.
Preferably, the compressed gas is a constant pressure compressed gas.
Preferably, before introducing compressed gas into the aluminum-plastic film of the lithium ion soft package battery to be tested, an air inlet hole needs to be formed in the aluminum-plastic film, and the air inlet hole is communicated with a compressed gas source.
Preferably, the aperture of the air inlet hole is 1-3 mm;
preferably, when the lithium ion soft package battery to be tested is a charged battery, the lithium ion soft package battery needs to be discharged to below 3V before the air inlet is opened.
Preferably, the awl is adopted to open the air inlet hole in a direction parallel to the large surface of the battery core of the lithium ion soft package battery to be detected, and the positive electrode, the negative electrode and the diaphragm of the lithium ion soft package battery to be detected are prevented from being punctured.
Preferably, the package strength is calculated according to equation (1):
A＝ t/P (1)
wherein, A is encapsulation strength, s/Mpa;
t is the stopping time from the beginning of inflation to the time when the cell ruptures or reaches a preset time, s;
p is the pressure value of compressed gas, Mpa.
Another object of the present invention is to provide a testing apparatus for the method for testing the packaging strength of the lithium ion soft package battery, so as to quantitatively evaluate the packaging strength of the packaging part of the battery.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the utility model provides a testing arrangement of lithium ion laminate polymer battery encapsulation intensity which characterized in that: the clamping device comprises a substrate, an upper pressing plate, a first clamping piece and a second clamping piece;
the upper pressing plate is arranged above the substrate and is arranged separately from the substrate; the upper pressing plate and the substrate are used for horizontally placing the lithium ion soft package battery to be tested; the upper pressure plate and the substrate can be detachably fixed together through a first clamping piece and a second clamping piece which are arranged at a certain distance; the upper pressing plate is provided with a window plate, and the window plate is positioned between the first clamping piece and the second clamping piece; the window plate is provided with an air inlet channel used for communicating an aluminum plastic film air inlet hole of the lithium ion soft package battery to be detected, a quick plug is installed in the air inlet channel and communicated with a compressed gas pipeline, and a compressor body pipeline is communicated with a compressed gas source.
Further, the substrate and the upper pressing plate are both rectangular flat plates; a sealing gasket is arranged between the quick plug and the air inlet channel; the air inlet channel is arranged at the central position of a region enclosed by the first clamping piece and the second clamping piece, and corresponds to the upper position and the lower position of an aluminum-plastic film air inlet hole of the lithium ion soft package battery to be tested in use.
Furthermore, the edge positions of the base plate and the upper pressure plate are respectively provided with a plurality of threaded holes for fixing the base plate and the upper pressure plate together.
Furthermore, a plurality of threaded holes are uniformly distributed on the outer side of an area enclosed by the first clamping piece and the second clamping piece.
Furthermore, the first clamping piece and the second clamping piece respectively comprise an upper fixing piece and a lower fixing piece, the upper fixing piece is arranged on the upper surface of the upper pressing plate, and the lower fixing piece is arranged on the lower surface of the substrate; the upper fixing piece and the lower fixing piece are connected through a fixing bolt.
Furthermore, the upper fixing piece and the lower fixing piece are both concave; the opening side of the upper fixing piece is clamped on the upper pressure plate, the opening side of the lower fixing piece is clamped on the base plate, and the opening sides of the upper fixing piece and the lower fixing piece are opposite; the vertical parts at the corresponding sides of the upper fixing piece and the lower fixing piece are fixedly connected together through fixing bolts.
Furthermore, in the first clamping piece and the second clamping piece, the height of the area defined by the opening sides of the upper fixing piece and the lower fixing piece is not more than the sum of the thicknesses of the lithium ion soft package battery to be tested, the upper pressing plate and the substrate.
Compared with the prior art, the method for testing the packaging strength of the lithium ion soft package battery has the following advantages:
according to the method for testing the packaging strength of the lithium ion soft package battery, after the battery is fixed, compressed gas is injected into the battery, the situation that the battery fails in packaging in the real use process (the battery is in a module or a pack bag) is simulated, the quantitative evaluation of the packaging strength of the battery can be realized, and the method has more accurate and visual guiding significance on the selection of battery packaging materials, the design of a packaging process and the evaluation of the reliability of the battery.
Compared with the prior art, the device for testing the packaging strength of the lithium ion soft package battery and the method for testing the packaging strength of the lithium ion soft package battery have the same advantages, and are not described herein again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a perspective view of a device for testing packaging strength of a lithium ion soft package battery according to an embodiment of the invention;
fig. 2 is a top view of a device for testing packaging strength of a lithium ion soft package battery according to an embodiment of the invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is an enlarged view at B in FIG. 3;
fig. 5 is a left side view of a device for testing packaging strength of a lithium ion soft package battery according to an embodiment of the invention;
fig. 6 is a front view of a device for testing packaging strength of a lithium-ion pouch battery according to an embodiment of the invention.
Description of reference numerals:
1-a first clamp; 101-upper fixing piece; 102-a lower fixture; 2-a second clamp; 3-a substrate; 4, an upper pressing plate; 5-a window panel; 6-sealing gaskets; 7-quick plug; 8-compressed gas pipeline; 10-fixing the bolt; 9-lithium ion soft package battery to be tested; 11-an intake passage; 12-a threaded hole; 13-air intake.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
Interpretation of terms:
1. lithium ion pouch battery: the outer package is a lithium ion battery packaged by an aluminum plastic film.
2. Packaging strength: the anti-failure capability of each packaging part of the aluminum plastic film. Compressed gas is filled into the packaged lithium ion battery at constant pressure P (unit Mpa), the state of expansion of the battery core during gas production is simulated, the time t (unit s) from the gas filling to the rupture (namely packaging failure) of the battery core is recorded, and the packaging strength is t/P, namely the pressure-resistant time under the unit pressure.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-5, the device for testing the packaging strength of the lithium ion soft package battery comprises a base plate 3, an upper pressing plate 4, a first clamping member 1 and a second clamping member 2; the upper pressing plate 4 is arranged above the substrate 3, and the upper pressing plate and the substrate are arranged separately, so that the lithium ion soft package battery to be tested can be horizontally placed between the upper pressing plate 4 and the substrate 3 during use; the first clamping part 1 and the second clamping part 2 detachably that top board 4 and 3 accessible intervals of base plate set up are together fixed, like this when will await measuring lithium ion laminate polymer battery level and place between top board 4 and base plate 3, can be in the same place top board 4, the lithium ion laminate polymer battery and the base plate 3 of awaiting measuring are fixed, owing to can dismantle the connection, also make things convenient for putting into and taking out of the lithium ion laminate polymer battery of awaiting measuring simultaneously. A window plate 5 is arranged on the upper pressure plate 4, and the window plate 5 is positioned between the first clamping piece 1 and the second clamping piece 2; be equipped with inlet channel 11 on looking the luffer board 5, install quick plug 7 in the inlet channel 11, quick plug 7 intercommunication compressed gas pipeline 8 can be through looking the luffer board with inlet channel and the examination lithium ion laminate polymer battery plastic-aluminum membrane's that awaits measuring in the use inlet port alignment.
In order to ensure that the pressure is applied to all parts of the lithium ion soft package battery to be tested in a balanced manner, the substrate 3 and the upper pressing plate 4 are both rectangular flat plates; at the same time, in order to ensure that there is no air leakage, a sealing gasket 6 is fitted between the quick connector 7 and the inlet channel 11. Preferably, in order to ensure that all parts of the lithium ion soft package battery to be tested are pressed uniformly, the air inlet channel is arranged at the central position between the first clamping piece and the second clamping piece to form an area, compressed air is smoothly introduced into the aluminum-plastic film air inlet hole of the lithium ion soft package battery to be tested in the using process, and the air inlet channel is preferably made to correspond to the upper position and the lower position of the aluminum-plastic film air inlet hole of the lithium ion soft package battery to be tested in the using process.
In the invention, a plurality of threaded holes 12 for fixing the base plate 3 and the upper pressure plate 4 together are arranged at the edge positions of the two. Preferably, the threaded holes 12 are uniformly distributed outside the area enclosed by the first clamping member 1 and the second clamping member 2. Doing so, except that adopt first holder and second holder to fix top board, base plate and the lithium ion laminate polymer battery that awaits measuring of placing between the two from the middle part, can also fix the three from the border position through the bolt that inserts each screw hole, further guarantee that the atress of each part of the lithium ion laminate polymer battery that awaits measuring in the test procedure is even. As a preferable case, 2 threaded holes are respectively arranged at the outer sides of the first clamping piece and the second clamping piece, 2 threaded holes at each side are respectively arranged at the front end and the rear end of the base plate 3 and the upper pressure plate 4, and the threaded holes at the same side and the threaded holes at the other side are symmetrical about the center of the air inlet channel. The threaded hole may be regarded as a positioning through hole in mounting.
As an alternative embodiment of the present invention, each of the first clamping member 1 and the second clamping member 2 includes an upper fixing member 101 and a lower fixing member 102, the upper fixing member 101 is disposed on the upper surface of the upper platen 4, and the lower fixing member 102 is disposed on the lower surface of the base plate 3; the upper fixture 101 and the lower fixture 102 are connected by a fixing bolt 10. Preferably, in order to apply pressure to the upper pressure plate and the substrate uniformly and facilitate the installation of the fixing bolt 10, the upper fixing member 101 and the lower fixing member 102 are both in a concave shape; the opening side of the upper fixture 101 is clamped on the upper platen 4, the opening side of the lower fixture 102 is clamped on the substrate 3, and the opening sides of the upper fixture 101 and the lower fixture 102 are opposite; the vertical portions of the upper fixing member 101 and the lower fixing member 102 on the sides corresponding to the positions are fixedly coupled together by fixing bolts 10. In addition, in order to meet the requirement that the gap between the upper pressing plate and each part of the substrate is equal to the thickness of the battery cell of the lithium ion soft package battery to be tested in the test, in the first clamping piece 1 and the second clamping piece 2, the height of the area enclosed by the opening sides of the upper fixing piece 101 and the lower fixing piece 102 is not more than the sum of the thicknesses of the lithium ion soft package battery to be tested, the upper pressing plate 4 and the substrate 3.
The testing device is adopted to test the packaging strength of the lithium ion soft package battery, and the testing method comprises the steps of horizontally fixing the lithium ion soft package battery 9 to be tested between the upper pressing plate 4 and the base plate 3 of the testing device for the packaging strength of the lithium ion soft package battery, charging compressed gas into the lithium ion soft package battery 9 to be tested at certain air pressure, recording the stopping time from the beginning of charging to the time when the battery breaks or reaches the preset time, and calculating to obtain the packaging strength.
Specifically, the method for charging compressed gas into the lithium ion soft package battery 9 to be tested at a certain air pressure comprises the following steps: and (3) forming an air inlet hole on the aluminum plastic film of the lithium ion soft package battery 9 to be detected, aligning and coinciding the air inlet hole with the air inlet channel 11, and introducing compressed air from an air source through a compressed air pipeline 8. Preferably, the aperture of the air inlet is 1-3mm, and particularly, when the lithium ion soft package battery (9) to be tested is a charged battery, the lithium ion soft package battery needs to be discharged to be less than 3V before the air inlet is opened. In addition, the trompil can adopt the awl trompil, also can adopt other trompil modes, when adopting the awl trompil, in order to avoid surveying positive pole, negative pole and the diaphragm of lithium ion laminate polymer battery 9 to be punctured, need carry out the inlet port trompil with being on a parallel with the lithium ion laminate polymer battery 9 electric core large face direction that awaits measuring with the awl.
During the test, need to guarantee before aerifing the beginning that the clearance volume of four angular position departments between top board 4 and the base plate 3 is equivalent with lithium ion laminate polymer battery 9's that awaits measuring electricity core thickness, better, the numerical value difference of each position clearance volume need be controlled within 0.1mm to guarantee top board 4 to the pressure balance of lithium ion laminate polymer battery 9 that awaits measuring.
In the test method, the packaging strength can be calculated according to the formula (1):
A＝ t/P (1)
wherein, A is encapsulation strength, s/Mpa;
t is the stopping time from the beginning of inflation to the time when the cell ruptures or reaches a preset time, s;
p is the pressure value of compressed gas, Mpa.
The following describes a method for testing the packaging strength of a lithium ion soft package battery by using the testing device of the invention.
Description of relevant parameters of the lithium ion soft package battery to be detected:
battery capacity 62 Ah; the thickness of the battery is 11.6 mm; the battery voltage is 2.9V; a 152 μm composite aluminum plastic film (ON + AL + PP) was used.
The specific steps of the test are as follows:
1. firstly, the whole testing device is horizontally placed on a plane workbench (the height of the workbench is recommended to be 0.8-1.2m, and the observation and the operation are convenient), a wrench is used for unscrewing the fixing bolt, and the upper fixing piece 101 and the upper pressure plate 4 are removed.
2. A small air inlet hole with the diameter of 2mm is drilled on the aluminum plastic film at the central position of the large surface of the main body of the lithium ion soft package battery 9 to be detected by using an awl (for an electrified battery, the discharge is required to be below 3V, and meanwhile, when the awl is used for puncturing the aluminum plastic film, the operation is carried out in the direction parallel to the large surface of the battery core, so that the puncturing of the anode, the cathode and the diaphragm of the battery is avoided).
3. The lithium ion soft package battery 9 to be measured is horizontally placed on the surface of the substrate 3, the opening surface faces upwards, and the opening position is aligned to the position of the central air inlet channel 11 of the substrate (batteries with different types and sizes can be positioned in an auxiliary mode by drawing a positioning line on the substrate).
4. The upper pressing plate 4 is horizontally placed on an electric core to be tested (namely the lithium ion soft package battery 9 to be tested), the positioning through holes of the upper pressing plate 4 and the base plate 3 are aligned, the bolt is inserted, the position of the air inlet hole of the battery is observed through the window plate 5, the position of the battery is adjusted to enable the air inlet hole to coincide with the air inlet channel 11 at the center of the window, and compressed gas is ensured to smoothly enter the battery.
5. The fastening bolts of the upper fixing piece 101 and the lower fixing piece 102 in the upper pressing plate 4, the base plate 3, the first clamping piece 1 and the second clamping piece 2 are locked by using a wrench, the gaps between the upper pressing plate 4 and the base plate 3 at the four corner positions are measured by using a ruler, the gap amount is preferably equal to the thickness of the battery cell, and the difference of the numerical values of the gaps is within +/-0.1 mm, so that the pressure of the upper pressing plate 4 to the battery is basically balanced.
6. The compressed gas pipeline 8 is communicated with a compressed gas source, the compressed gas pipeline 8 is inserted into the quick plug 7, the pressure value of the compressed gas is adjusted to be P (megapascal/Mpa), a stopwatch is used for starting timing while a gas source switch is opened, and timing is stopped when the preset time (second/S) is reached. Finally, calculating according to the formula (1), and obtaining the encapsulation strength (s/Mpa).
In the test example, the preset time is 600s, the pressure value of the compressed gas is 0.5Mpa, when the timing is finished, the top seal position of the negative pole ear side of the battery is obviously bulged and deformed, the aluminum plastic film and the tab sealant are torn and layered, and the effective packaging width is reduced to 0.5mm from the initial 5.5 mm. The test can identify the position with the minimum sealing strength in each sealing part in the battery as the position of the negative pole ear side top sealing, and the sealing strength is 600s/0.5Mpa and 1200 s/Mpa.
It should be noted that the above test example is only one specific application example of the method for testing the packaging strength of the lithium ion soft package battery, and is not intended to represent all of the application examples. In the method for testing the packaging strength of the lithium ion soft package battery, the relevant parameters of the lithium ion soft package battery to be tested are not limited to the relevant parameters of the test example, and the method for testing the packaging strength of the lithium ion soft package battery is suitable for testing the packaging strength of all the existing soft package lithium ion batteries.
In summary, the method for testing the packaging strength of the lithium ion soft package battery comprises the steps of designing a simple testing device, fixing the battery between a substrate and an upper pressing plate of the device, charging compressed gas with constant air pressure into the battery, and recording the time from the charging to the packaging aging of the battery by using a stopwatch, so that the length of the time which can be borne by the packaging part of the battery under the unit pressure is calculated, and the quantitative evaluation of the packaging strength of the battery is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for testing the packaging strength of a lithium ion soft package battery is characterized by comprising the following steps: the method comprises the steps of horizontally placing and fixing the lithium ion soft package battery (9) to be tested, introducing compressed gas into an aluminum-plastic film of the lithium ion soft package battery (9) to be tested, recording the stopping time of the battery from the beginning of inflation to the time when the battery breaks or reaches the preset time, and calculating the packaging strength.
2. The method for testing the packaging strength of the lithium-ion soft package battery according to claim 1, wherein the method comprises the following steps: the method for fixing the lithium ion soft package battery (9) to be tested comprises the steps of uniformly applying pressure to the upper surface and the lower surface of the lithium ion soft package battery (9) to be tested, and ensuring that the thickness of the battery is always kept at the thickness of the battery core.
3. The method for testing the packaging strength of the lithium-ion soft package battery according to claim 1, wherein the method comprises the following steps: the compressed gas is constant pressure compressed gas.
4. The method for testing the packaging strength of the lithium-ion soft package battery according to claim 1 or 3, wherein the method comprises the following steps: before introducing compressed gas into the aluminum-plastic film of the lithium ion soft package battery (9) to be detected, an air inlet hole is formed in the aluminum-plastic film, and the air inlet hole is communicated with a compressed gas source;
preferably, the aperture of the air inlet hole is 1-3 mm;
preferably, when the lithium ion soft package battery (9) to be tested is a charged battery, before the air inlet is opened, the power needs to be discharged to be below 3V;
preferably, the awl is adopted to open the air inlet hole in the direction parallel to the large surface of the battery core of the lithium ion soft package battery (9) to be detected, and the positive electrode, the negative electrode and the diaphragm of the lithium ion soft package battery (9) to be detected are prevented from being punctured.
5. The method for testing the packaging strength of the lithium-ion soft package battery according to any one of claims 1 to 4, wherein the method comprises the following steps: the package strength was calculated as in equation (1):
A＝t/P (1)
wherein, A is encapsulation strength, s/Mpa;
t is the stopping time from the beginning of inflation to the time when the cell ruptures or reaches a preset time, s;
p is the pressure value of compressed gas, Mpa.
6. A testing device for the lithium-ion soft package battery packaging strength testing method according to any one of claims 1 to 5, is characterized in that: comprises a substrate (3), an upper pressure plate (4), a first clamping piece (1) and a second clamping piece (2);
the upper pressing plate (4) is arranged above the substrate (3) and is separated from the substrate; the upper pressing plate (4) and the base plate (3) are used for horizontally placing the lithium ion soft package battery (9) to be tested; the upper pressure plate (4) and the substrate (3) can be detachably fixed together through a first clamping piece (1) and a second clamping piece (2) which are arranged at a certain distance; a window plate (5) is arranged on the upper pressure plate (4), and the window plate (5) is positioned between the first clamping piece (1) and the second clamping piece (2); be equipped with inlet channel (11) that are used for communicateing the lithium ion laminate polymer battery plastic-aluminum membrane inlet port that awaits measuring on window board (5), install quick plug (7) in inlet channel (11), quick plug (7) intercommunication compressed gas pipeline (8), compressor body pipeline (8) intercommunication compressed gas source.
7. The device for testing the packaging strength of the lithium-ion soft package battery according to claim 6, wherein: the substrate (3) and the upper pressing plate (4) are both rectangular flat plates; a sealing gasket (6) is arranged between the quick plug (7) and the air inlet channel (11); air inlet channel (11) is established and is enclosed the central point that encloses into the region between first holder (1) and second holder (2) and puts, and air inlet channel (11) and the lithium ion laminate polymer battery plastic-aluminum membrane inlet port's that awaits measuring upper and lower position corresponding during the use.
8. The device for testing the packaging strength of the lithium-ion soft package battery according to claim 6 or 7, wherein: the edge positions of the base plate (3) and the upper pressure plate (4) are respectively provided with a plurality of threaded holes (12) for fixing the base plate and the upper pressure plate together.
9. The device for testing the packaging strength of the lithium-ion soft package battery according to claim 8, wherein: the threaded holes (12) are uniformly distributed on the outer side of an area enclosed by the first clamping piece (1) and the second clamping piece (2).
10. The device for testing the packaging strength of the lithium-ion soft package battery according to claim 6, wherein: the first clamping piece (1) and the second clamping piece (2) respectively comprise an upper fixing piece (101) and a lower fixing piece (102), the upper fixing piece (101) is arranged on the upper surface of the upper pressing plate (4), and the lower fixing piece (102) is arranged on the lower surface of the base plate (3); the upper fixing piece (101) is connected with the lower fixing piece (102) through a fixing bolt (10);
preferably, the upper fixing piece (101) and the lower fixing piece (102) are both concave; the opening side of the upper fixing piece (101) is clamped on the upper pressure plate (4), the opening side of the lower fixing piece (102) is clamped on the base plate (3), and the opening sides of the upper fixing piece (101) and the lower fixing piece (102) are opposite; the vertical parts of the upper fixing piece (101) and the lower fixing piece (102) on the corresponding sides are fixedly connected together through a fixing bolt (10).
Preferably, in the first clamping piece (1) and the second clamping piece (2), the height of an area defined by the opening sides of the upper fixing piece (101) and the lower fixing piece (102) is less than or equal to the sum of the thicknesses of the lithium ion soft package battery (9) to be tested, the upper pressing plate (4) and the substrate (3).
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| CN115032546A (en) * | 2022-08-15 | 2022-09-09 | 常州武进中瑞电子科技股份有限公司 | A testing arrangement for lithium cell reliability detects |
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| CN115032546A (en) * | 2022-08-15 | 2022-09-09 | 常州武进中瑞电子科技股份有限公司 | A testing arrangement for lithium cell reliability detects |
| CN115032546B (en) * | 2022-08-15 | 2022-11-22 | 常州武进中瑞电子科技股份有限公司 | A testing arrangement for lithium cell reliability detects |
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